<LINK type="text/css" HREF="style.css" rel="stylesheet">
<h1>set_dif</h1>
<p>Returns the difference between two sets. The difference set's elements will be those elements wich are part of the firs set, and are not parts of the second set. </p>
<h2>parameters:</h2>
<ol>
  <li>A set's name</li>
  <li>A Set's name  </li>
</ol>
